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Periodic Classifications of Elements
Use Mendeleev’s Periodic Table to predict the formulae for the oxides of the following elements: K, C, Al, Si, Ba.
Dmitri Mendeleev gave a periodic law to arrange the elements. According to this law, the properties of elements are the periodic function of their atomic masses.
The potassium is placed in group I of Mendeleev’ Periodic table. The oxide and hydride of Group I elements are R2O and RH respectively. Thus, K2O is the oxide of potassium.
The carbon is placed in group IV of Mendeleev’ Periodic table. The oxide and hydride of Group IV elements are RO2 and RH4 respectively. Thus, CO2 is the oxide of carbon.
The aluminium is placed in group III of Mendeleev’ Periodic table. The oxide and hydride of Group III elements are R2O3 and RH3 respectively. Thus, Al2O3 is the oxide of aluminium.
The silicon is placed in group IV of Mendeleev’ Periodic table. The oxide and hydride of Group IV elements are RO2 and RH4 respectively. Thus, SiO2 is the oxide of silicon.
The barium is placed in group II of Mendeleev’ Periodic table. The oxide and hydride of Group II elements are RO and RH2 respectively. Thus, BaO is the oxide of barium.
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